One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,15)(12,14)(13,16)(17,18)(19,24)(20,27)(21,26)(22,28)(23,25)(29,32)(30,31) involution — undirected(2,6)(7,8)(9,11,12,16)(10,13,14,15)(17,19,22,30)(18,24,28,31)(20,21,23,29)(25,32,27,26)(1,3,5,4)(2,7,6,8)(10,14)(11,16)(17,20,22,23)(18,25,28,27)(19,29,30,21)(24,26,31,32)(1,4,5,3)(2,8,6,7)(10,14)(11,16)(17,21,23,30,22,29,20,19)(18,26,25,31,28,32,27,24)(2,6)(7,8)(10,14)(13,15)(17,20,22,23)(18,27,28,25)(19,21,30,29)(24,26,31,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.